What you need to avoid stacking an 81a and a polarizer is a Moose filter
by Moose Peterson (a different Moose than our Moose). The Moose filter
is an 81a and a polzarizer rolled into one. See it here:
<http://www.vividlight.com/articles/304.htm>
Chuck Norcutt
Bill Pearce wrote:
>
>>Say you've got a UV filter on a 28-70 on an OM-1. Say you then want to
>>use a Polariser on that lens. Do you take the UV filter off first, or
>>just stack them ? The blurb from the UV filter says " it reduces the
>>excess bluishness the frequently occurs in outdoor colour photography."
>>However the polariser tends to heighten blues in the sky and make cloud
>>bolder. Will they cancel out to some extent ?
>
>
> It will cancel out sharpness and increase flare.
>
> Never stack filters, as the possibilities of degraded images increases a
> lot.
>
> to put my iron in the first fire, I never use UV or protective filters. If I
> need some haze reduction, such as I will in the area around Santa Fe next
> month, I use an 81A or such. It is especially valuable at higher altitudes.
> Otherwise, with color film, it's a polarizer if required, otherwise I go
> commando, so to speak.
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